Pressure indicator and recorder.



PATENTE?) J N. l, 1907.

H. BMSTOL. URB fz'jmmo AND RBGURDER APILIUATON FILED MARJB, 1905.

EHESS To (LZ/ whom it 'nen/y concern:

NiTED STES lr-iTEilT FFCE.

lVILLiAM H. BRISTOL, (12F NEW YORK, N. Y.

vPRESSURE lhiDiCATGF ANW RECHDEF.

No. 839,981. Specification of Letters Patent.

Patented. Jan. l, 1907.

Application filed Merch 18,1905. Serial No. 250,744.

Be it lniown that i, lViLLiAM il. Bins'ror, a citizen o.' the United Sintes of America., residing at New wrorli, in the county of ew York and State oi New `'orli, have invented certain new and useful .li'nproveinents in, Pi essure indicators and Recorders, ol' which the following e specification.

lily invention relates to improvements in devices for indicating or recording pressures or variations thereof, end particulerl y to the-t class ol pressure indicating or recording devices in which the elongation or expansion oi' an expensible chamber is converted into e deflection, serving to indie-:ite the existing pressure by suitably restraining the motion of seid chamber.

My present invention is an iini'irovenient on my former invention patented February el, i890, No. 420,570, und has for its object to give greater freedom ci movement to such devices, to decrease the length of chamber, to prevent leg, lo insure prompt return on decrease in pressure, and to permit oi' a. di versity of scales.

For this purpose my invention consists, essentially, of un expansiblo chamber which is constrained to e deiinite direction oi motion by two ilexible restraining -springs placed at right angles to the plane or motion end rigidly connected to the top und bottoni oi saidcheniber in such a manner that their plane is parallel to or inclined to the exis of normal expansion ol seid chamber.

My invention will best be understood when described in connection with the following drawings, in which- Figure l. illustrates the application oi my invention to e recording device. Fig. 2 is en enlarged cross-sectional view. Fig. 3 is e side view. Figs; 4 to 7 ere views showing modifications.

Similar numerals oi reference designate corresponding parts throughout the several views.

Referring now to the dre-wings, l is e cese of any suitable indicating or recording mechanism, provided with a diei 2, upon which the continuous record of the pressure is mede.

3 is e connecting-pipe through whiclrthe pressure to be measured is brought to the instruinent.

4 is a erforeted head secured to the pipe 3 and to t e case and adapted to form one end oi the expansible chamber 5. This expensiblephel'm'ber is closed et the top and has e.

non-ilexible plete 6, to which is uttuched'the pointer 7, which indicates or records the prossurc existing in the chamber 5. 4This chember may be composed of e series oi sections oit perforated diaphragme, either plein or corrugated, es shown in Figs. l to 5, or it muy consist of e single expansible section, es shown in Fig. 7, the plete being connected to the rigid sides oi the chamber by some ilexible materiel, such es rubber, leather, ete. internal pressure applied to the chember 5 will cause it to expend. To utilize this expansion for the purpose of measuring the pressure, i provide two 'flexible restrainingsprings, such es the two strips or two resilient wires S, which are rigidly connected to the bottoni of said chamber and to vertical projections 9 et the top of seid chamber, es shown in Figs. l, 2, 55, und 7. These strips are so disposed that their plane is either per allel to the exis oi normal expansion of the chamber, shown in Figs. l, 2, 3, Li, and 7, inclined. 'to it, es shown in Figs. 5 and 6. ln iiigs. 4 to (i l have shown this strip rigidly connected to the top Aoi' the chamber instead of to e projecting erm. 9, Figs l, 2, 3, :ind 7. By thus shortenuig the strip the freedom of motion is somewhat impaired, but is nevertireless much better than the motion obtained in the older style of instruments.

By varying the ilexibility oi the restrain ing springs or strips, es by altering their iorin, erossesectlon, or width, i am enabled to obtain e great diversity of dei'leotions and have also found it possible by this means to obtain a. substantially uniform scale for unit changes oi pressure. ln Fig. 6 l .have shown the width of the strips 8 tapered toward the bottoni, thereby imparting greater flexibility to the lower part ol the strips than to the upper )zi-rt. l may also obtain e diversity of scales y fastening the strips et various pieces es, lor exemple, as indicated in Fig. 5. The pairticuler manner of attaching the springs as herein set forth causes them. to return the ch amber on decrease in pressure therein and also to definitely determine the zero position of the pointer. To further secure s. fixed zero posit-ion, l may piece e slight initial tension on the chamber in fastening the springs.

What l claim es new, and desire te secure by Letters Patent, ,is--4 l. In a pressure indicator or recorder ,the combination with en expansible chamber, of two ilexible restraining-springs placed edgewisc with respect to seid chercher and rigidly 2. In a pressure indicator or recorder; they vcombination with an expansible chamber, an indicating-arm attached to said chamber, of two flexible restraining-springs placed edgewise with respect to said chamber and rigidly secured only at the top and bottom of said chamber and'otherwise free and clear thereof, and. adapted to convert theexpansion of the` said chamber into a deflection, said springs having the planes of their side faces in common planes at right angles to the plane of deflection oi the axis ol' said expansible chamber.

3. In a pressure indicator or recorder; the combination with an expansible chamber, of two flexible restrainingsprings of variable crossesection rigidly secured to the top and bottom of said chamber, but otherwise free and clear thereof, and adapted toconvert the expansion of said chamber into a deflection, said springs having the planes of ,their side faces in. common planes at right angles to the `plane of deflection of the axis of said cham- 4. In a ressure indicator or recorder; the combination with an expansible chamber, an indicating-arm attached to said chamber, .of two flexible restraining-sori1igs of variable cross-section rigidly seen. d' to the top and bottom of said chamber, but otherwise iree and clear thereof, and adapted to convert the expansion of said Vchamber into a deflection, said springs having the planes of their side faces in common' planes at right angles to the plane of deflection of the axis. of said chain- 5. In a pressure indicator or recorder; the combination with an expansible chamber composed of a series of perforated disks, of two flexible restraining-spr]ngs placed. edge- Wisewith respect to said chamber and rigidly secured only at thetop and bottom of said nchamber and otherwise lfree and clear thereoffand adapted to convert the expansion of said chamber into a' deflection, saidh springs having the planes of their side faces in cpm- Inon planes at right angles to the plane of dcection of the axis of said expansible chamber. 6. In a pressure indicator or recorder; the combination with an expansible chamber, composed of a series of perforated disks, and two flexible restraining-springs of variablev cross-section placed edgewise with respect to said chamber and rigidly secured only at the top and bottom of said chamber and otherwise free and clear thereof and adapted to convert the expansion of said chamber into a deflection, said springs havl ing the planes of their side faces in common planes at right angles to the plane of deflection,oi the axis of saidv expansible chamber.

7. In a pressure indicator or recorder; the combination with an expansible chamber, of two flexible flat restraining-springs placed edgewisc with. respect to said chamber and rigidly secured to the top and bottom of said chamber but otherwise free and clear thereof, and adapted to convert the expansion of the said chamber into a deflection, said springs having the planes of their side faces in com mon planes at right i ngles to the plane of deflection of the axis of said expansible chamber.

8. In a pressure indicator or recorder; the combination with an expansible chamber, an indicating-arm attached to said chamber, of two iiexible flat restraining-springs placed edgewise with respect to said chamber and rigidly secured to the top and vbottom of said cham lier but otherwise free and clear thereof and adapted to convert the expansion of the said chamber into a deiiection, said springs having the planes olf their side faces in common planes at right angles to the plane of de* ilcction. of the axis ofsaidexpansible chamber.

Q. in a pressure indicator or recorder, the combination with an expansible chamber, of two `flexible flat restraining-springs of vari able cross-section rigidly secured to the top and bottom of said chamber, but otherwise 'fre'e and clear thereof, and adaptedto con.- vert the expansion of said chamber into a deflection, said springs having the planes of their side faces in common planes at right angies to the plane of deflection of the axis of said chamber.

10. In a pressure indicator or recorder; the combinatipn with an expansible chamber, an indicating-arm attached to said chamber, of two flexible flat restraining-springs of variable cross-section rigidly'secured vto the top and bottom of said chamber, but ,otherwise free and clear thereof, and adapted to convert the expansion of. said cham ber into a delection, said springs having the planes of their side faces in commen planes at right angles to the plane of deflection of the axis of said chamber.

ll. Irl a pressure indicator or recorder; the combination with an expansible chamber composed of a series of perforated disks, of

two flexible iiat restraining-springs placed edgewise with respect to said chamber land rigidly secured to the top and bottom of said chamber, but otherwise free and clear thereof and adapted to convert .the expansion of said chamber into a deflection, said springs having the planes of their side faces in common vplanes at right angles to the plane of delictetion ofthe axis of said expansible chamber.

IOO

12. In e'pressure indicator or recorder ;the gies to the plane of deflection of the axis of combination with en expensible chamber, said expansibie chamber. composed of a series of perforated disks, and In testimony whereof` I have signed my two iexibie flat restraining-springs of Varil 11eme to this specification, in the presence of 5 able cross-section rigidly Secured to the top two subscribing witnesses, this 16th day of I5 and bottom of seid chamber but otherwise March, 1905.

free and clear thereof and adapted to Convert WILLIAM H. BRISTOL. the expansion oi said chamber into a de- Witnesses 1' fiection, said springs having theplenes of A. FABER DU FAUR,

lIo their side faces in common planes at right en- RAENA H. YUDIZKY. 

